Ischaemum muticum L.

This is a littoral plant.

This seashore plant forms extensive colonies that bind the sand at the back of sandy beaches.

Culm geniculate, about 2.5 mm in diameter, conspicuously noded. Blade brownish-red, 7-8 cm long by 1 cm wide, petiolate, hirsute on both surfaces; ligule truncate, about 0.3 mm long; sheath hirsute. Racemes 2, not exceeding the uppermost sheath, about 2.5 cm long. Spikelets paired, more or less similar, the upper pedicellate, the lower sessile, lanceolate, about 7 mm long; rachis swollen and winged. Lower glume coriaceous, broadly lanceolate, as long as the spikelet, 2-keeled and winged on the upper part, inconspicuously numerous-nerved and tessellate nerved; upper glume coriaceous, broadly lanceolate and boat-shaped, 1-keeled and winged on the upper back, pointed, margins membranous and fimbriate. Lower floret subcoriaceous, about 6 mm long; lemma lanceolate, margins slightly inrolled, fimbriate; palea lanceolate, 2-keeled, margins membranous, fimbriate. Upper floret membranous, brownish-red; lemma boat-shaped, with 2 conspicuous lateral nerves, shortly aristate, upper margins fimbriate; palea linear-lanceolate, 2-keeled, fimbriate along margins, anthers about 2.3 mm long.

Perennial, strongly rhizomatous; rhizomes clothed in cataphylls. Culms often red, much branched, stoloniferous or scrambling, several meters long, flowering culms erect, up to 60 cm, nodes glabrous. Leaf sheaths ciliate along outer margin, otherwise glabrous or sparingly appressed hairy; leaf blades lanceolate, tinged reddish brown, 2–10(–18) × 0.3–1.7 cm, glabrous or abaxial surface sparingly pilose, margins smooth or scaberulous, base cordate, very shortly pseudopetiolate, apex acute; ligule 0.2–0.6 mm. Racemes usually paired, appressed back to back, 2–5 cm, base enclosed by subtending sheath; rachis internodes and pedicels oblong, triquetrous, outer angle narrowly winged, inner angles glabrous or ciliolate. Sessile spikelet lanceolate, 4.8–7 × 2.5–2.8 mm; lower glume leathery with expanded rounded flanks in lower 2/3, herbaceous, strongly veined and sharply 2-keeled below apex, glabrous, winged from near base, apex entire; upper glume winged on upper keel; upper lemma subentire, mucronate or with ca. 1 mm awnlet. Pedicelled spikelet laterally compressed, otherwise resembling sessile or smaller, awnless.

Distributed in the Ryukyus, Taiwan, Indo-Malaysia and North Australia

Taiwan [Cambodia, India, Indonesia, Japan (S Ryukyu Islands), Malaysia, Myanmar, New Guinea, Philippines, Sri Lanka, Thailand, Vietnam; Australia (Queensland)].

Sands near the sea; below 100 m.

Agrostis javanica é uma espécie de gramínea do gênero Agrostis, pertencente à família Poaceae.

Ischaemum muticum là một loài thực vật có hoa trong họ Hòa thảo. Loài này được L. mô tả khoa học đầu tiên năm 1753.

无芒鸭嘴草（学名：Ischaemum muticum），为禾本科鸭嘴草属下的一个植物种。